I'm getting this really odd error where a while after using the floating icon fix I get not only the fixed icon, but also the floating one! This only happens with the DC-17 ICWS weapons. I have rescaled them. These scales are different for each attachment, but I rescaled them somewhat before the problem started. I have also cleaned several times, have deleted the BUILD/sides/rc1 and Addon/TST folders more than once and at the same time, and have even made a new map, which worked once, but after loading the original LUA it came back and won't go away.
Ironically this started just after Gametoast went down.

DC-17 blaster ODF DC-17 blaster .msh option Mission LUA extraweapons HUD

Your extraweapons.hud file seems fine. However, by the looks of your LUA it appears you are loading multiple custom sides. Are any of these sides also using an extraweapons.hud file? If so, try keeping all the HUD icon information in just one of these sides' extraweapons.hud file. The cause of your double HUD icon trouble may be due to using multiple extraweapons.hud files over several different sides.

I had the same problem and the cause was exactly what AQT described.

The problem might have started when I loaded cln. I'll try moving the rc1 files into the cln extraweapons.

Do they both need con_inv_mesh?

Only one side should reference the con_inv_mesh in its REQ.

So i had the same problem, but with an other cause. Here is my solution:

I made a sidemod with custom rep and cis sides. But i haven't changed the vehicles and loaded them from the stock rep/cis lvl file. You have to load the stock lvl files BEFORE the custom once. I have no idea why, but it works.